Sheet-metal-punching press.



No. 854,706. PATENTED MAY 21, 1907.

J. A. EDEN, JR. 1

SHEET METAL PUNOHING PRESS. APPLIOATION FILED JULY27,1906.

3 BHEETB-BHEBT 1.

witmaogeo I vewfoz WM i r 4 VMM&V 513 GUM/14213 PATENTED MAY 21, 1907.

' J.A.EDEN,JB. SHEET METAL PUNCHING PRESS.

APPLICATION FILED JULYZ'I, 1905..

3 SHEETS-SHEET 2.

vii/ I116 .llllllrla T/ll/ll/Z Witmaqoeo odfif mw 5551 Qttozmey, (5:4.E,

QM. M

if n %#E M M M &5 W 3 W F 20km emfoz 351 Guam 1mg 3 SHEETS-SHEET 8.

PATENTED MAY 21, 1907.

APPLICATION FILED JULY27, 1905.

J A EDEN, J1: SHEET METAL PUNGHING PRESS.

I F-v qxhtneoogo To all whom zit-may concern:

ram oFiuoE. I

JAMES A. EDEN, JR., OF BROOKLYN, NEW YORK, ASSIGNOR, BY MESNEASSIGNMENTS, TO REES HOOK COMPANY, OF ELMIRA, NEW YORK.

Specification of Letters.Pa.tent-.

Patented May 21, 1907.

Application filed July 27 1905. Serial No, 271.480-

Be it known that I, JAMES A. EDEN, Jr., a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Sheet-Metal-PunchingPresses, of which the following is a specification.

This invention relates to improvements in power presses for forming andpunching out blanks from sheet metal; and the principal object of myimprovements is to provide a press of this character which will becapable of forming and cutting out from strips of sheet steel the blanksfrom which are formed lacing hooks for shoes and the like, and espe-'cially the blanks for the hooks shown and described in Letters-Patentobtained .by Fred" H. Rees, No. 793609, dated June27, 1905.

A further object is to so construct and arrange the punches and. diesthat the eyelet and head portions of the hook may be formed and thecompleted blanks cut from the strip all in the same press. I

A still further object is to form the blanks on the strip transverselythereby economizing material and increasing the number of blanks thatcan be out from a single strip: and finally, to provide means forpreventing the strip from bending or. warping as the metal is drawn inreceiving the several consecutive impressions in the dies, thereby en-tabling me to utilize the strip as a carrier for the blanks from die tochine.

I attain my objects by constructing and arranging the punches and diesin the press in the manner illustrated in the accompanying drawings, inwhich Figure 1 represents a front elevation of a power press, singleacting, with automatic double roll feed, embodying. my invention; Fig.2, a vertical sectional front view of the dies, punches and adjacentparts, the punch holder and punchesbeing shown in the down position;Fig. 3, a vertical transverse section on the line 33 in Fig. 2 Fig. 4, abottom die through the maview, full size, of the strip from which theblanks are punched, which also shows the shape of the dies; Fig. 5, aside elevation of the finished blank; and Fig. 6, a view of the punchesand stripper platelooking at them. from the under side with thesupplemental plate 34 removed. v p

.ber and shape with the punches.

Like numerals'refer to like parts in the several views.

In carrying out my invention, I make use of acommon form of power press,comprising a reciprocating cross-head 1, which slides in vertical guidessupported by vertical standards, said cross-head being operated by apitman 2, coupled to a crank shaft 3, which is driven by a belt pulley4.

To the bottom of the cross-head is fastened a holder 5, adapted to carrya. number of punch blocks 6. These punch blocks are rectangular in form,with cylindrical shanks 7, which are received in corresponding socketsin the holder 5, and are held in their proper adjustment by means of setscrews 8 and lock nuts 9, the latter being screwed upon the threadedlower portion of the shanks 7 and adapted to stand the punchingpressure, which is transmitted through the punches to the under-face ofthe holder 5.

To adjust the individual punches to orfrom the dies, the shank of thepunch block is run up into the holder and held in frictional engagementtherewith by means of the set screws 8, then by loosening the lock nuts9 and turning the nut-which engages the lower face of the holder, thepunch will be drawn down until it is set at the required distance fromthe die, after which the lock nuts will be set up tight and also the setscrew 8.

-Upon the table 12 of the press there is rigidly fastened a die holder11, in which is located a series of dies corresponding in num- Thesedies are placed in a horizontal groove in the holder, one side of whichis beveled to receive the beveled sides of the dies, the opposite sidesof the dies being. also beveled and engaged by a wedge block or blocks15. The dies are held end-wise in the holder by means of the block 13,which is set up against the dies by means of the set screws 14.Theindividual dies may thus be readily changed or renewed, as occasionrequires. Guide plates 16 are positioned over the dies, at a suitabledistance apart, to receive between them the strip of metal from whichthe blanks are to be formed. The lower ends of the punch blocks passthrough corresponding holes in a stripper plate 17, actuated by coiledsprings surrounding vertical guide rods 40, which have a limitedvertical movement in the holder 5, to press below the punch blocks, as

the cross-head rises, to clear the punches from the strip.

In order to positively clear the strip from the dies, and to lift itsufficiently to permit the impressions formed on its under-side to assover the top of thedies, as the strip is fed through the press, Iprovide for each die, in which the blank receives a forming impression,a plunger or knockout 18. These knock-outs reciprocate in the guidebracket 19, and are operated by levers attached to a rock shaft 21,which is actuated to throw the knock-outs upward with each upward strokeof the cross-head. The upper ends of these knock-outs are guided throughholes in the table and die holder, and they are reduced at their upperextremities to pass through smaller holesin the dies. The rock shaft isoperated by means of an arm 22 at one end.

coupled to a rod 23 which passes up to the main shaft 3, where it isprovided with rollers 24, which engage a cam 25 on said shaft.

The strip is fed through from one side to the other of the pressintermittently by means of a roll feed, comprising pairs of rolls 26positioned at each end of the guide 16, the lower rolls of each pairbeing rotated by ratchet gears 27, operated by a rod 28 coupled to acrank pin 29 on the end of the main shaft, motion being transmitted fromone ratchet gear to the other by means of a connecting rod 30. The stripis held in frictional engagement between the rolls by means of springsacting upon the upper rolls, said upper rolls being thrown out ofengagement with the strip during the period of receiving impressionsfrom the punches, by means of ever arms 31, actuated by pins '32 carriedby the cross-bar 33 attached to the cross-head;

said pins 32 being adjustable in the ends of said cross bar, in orderthat the lifting of the top rolls may be properly timed to release thestrip before it is engaged by the punches. The releasing of thestripfrom the grip of the feed rolls permits the strip to so adjustitself that the impressions will properly register with the dies. Thisautomatic feed is old and I do not claim it as a part of my invention.

As it is desirable to make the lacing hooks,

above referred to, of steel in order to give them the necessary strengthand rigidity, a special construction of the punches and dies is renderednecessary, inorder to pro erly .press the steel strip, from which the banks are to be cut, into shape to form the eyelet and head of the hook.In the first place the strip must be partially cut through between eachblank in order to make allowance for the drawing of the metal in formingthe eyelets 36, seeFigs. 4 and 5; otherwise the strip would be bent andtwisted so that it would not pass straight through the press between theguides. To perform this preliminary cutting of the strip I provide thefirst punch block 6 with a knife blade 39, so set as to partially cutthrough the strip from the rear toward the front, as the strip is fedthrough the press, as shown at 38 in Fig. 4E. The uncut portion of thestrip acts as a carrier to convey the blanks from die to die through thepress. A; spring pin 35 lifts the strip as the knife rises, so that thedepressed lip formed by the cut will pass over the edge of the die asthe strip is fed forward. When the strip reaches the second' die it isgiven a preliminary impression for the eyelet by the second punch, inthe portion lying between cuts. In the third, fourth and fifth dies thecap portion of this impression is still further drawn down by thepunches in succession until the full depth of the eyeletis reached. Atthe same time the base of the eyelet is drawn in and reduced in diameterin these succeeding dies. 7 In the sixth die a small plunger on thepunch passes completely through the eyelet, cutting the cap portiontherefrom, which drops through the hole provided therefor below the die,there being no knock-out for this die. In the seventh die a hexagonalplunger on the punch passes through the eyelet, cutting or nicking thewalls thereof at the lower extremity, to provide for the upsetting ofthe eyelet when the completed hook is riveted to a shoe in a rivetingmachine. In the next to the last die the blank receives the impression37for the head of the hook, and in the last die the completed blank is cutfrom the strip, and drops from the machine in the form shown in Fig. 5.showing these last two dies and their corresponding punches the sectionline in Fig. 2 is brought forward sufficiently to cut. through said diesat the point where the head of the hook is formed. The finished blankwill be assed to an assembling machine, where the fiead will bebent overabove the eyelet and the spring attached.

It will be noted that the punch blocks 6 are set slightly forward out ofcenter with their shanks 7. This is done in order that the formingheads, or plu ngers, carried by the punch-blocks, and by'which theeyelet portion of the hooks is formed, shall be positioned directly inline with the shanks of the punches, to the end that the heavy punchingpressure shall be transmitted directly through the shanks to the punchholder.

For the purpose of LOO This arrangement of the punch blocks alsoprovides a fiat under face thereon of a width slightly less than that ofthe strip, whereby the strip will be pressed upon and maintained inperfectly flat condition while passing punch shanks, where they areneeded to sea-me raise the eyelet cones out from the dies: At

' ceding dies, these intermediate pockets being.

shown in Fig. 2.

34 the stripped plate 17 is provided with a supplementary plate,,through which the small eyelet perforating and nicking plungers on thesixth and seventh punch-blocks pass, as do also the head'forming andcutting out plungers on the last two punch blocks. This auxiliary plateforms a guide for these punch plungers, and also engages the metal stripin close proximity to these plungers, as they are withdrawn, tosupplement the stripping action of the main stripper plate 17.

Since there must be a cut 38 at each side of the portion of the strip inwhich eacheyelet is formed, to allow for the drawing of the metal ateach side of the eyelet, the strip for each reciprocation of the presswill be advanced only the distance between these cuts: and to allow forthis periodic movement, pockets are out between the dies to receive theportions of the blank which have been formed in pre- It will be notedthat the strip receives two impressions from each punch before itreaches the next'succeeding' punch. This permits the punches and dies tobe spaced apart sufficiently to give them the necessary body strengthand also to allow for the adjusting nuts on each of the punch shanks.The intermediate pockets also act to adjust the strip and to rectify anydeviation in spacing and alinement due to the drawing action of thepunches. This arrangement of the punches anddies gives to them thenecessary strength to adapt the press for use in forming articles ofthis nature from sheet steel, where a powerful action is required todraw the metal in forming it into the proper shapes. Moreover, byadopting the step by step process of drawing the metal in forming deepimpressions such as the eyelet herein shown, I provide for drawing themetal a little at a time and in sectional parts, thereby avoiding thetearing of'the metal and also the straining of the dies. I have providedfor four impressions in drawing down the eyelet in the present instance.I may, however, accomplish this with a less number of impressions; and,where the impressions are to be made of greater depth, I may employ moreof the successiveformativepunches to accomplish the final result.

While I have shown the lacing hook blank cut out with side projectinears, by which the spring described in the etters-Patent to Rees,aforesaid, is attached to the hook, these ears may be omitted from thehook in the cutting out unch, thereby producing a lacing hook a apted tobe used without the spring feature.

Finally, while I have described .my imrovements in metal punchingpresses as belng adapted for cutting out blanks for lacing 'derside ofthe punch b are substantially the same.

What I claim, therefore, as my invention and desire to secure byLetters-Patent is 1. In a metal punching press, the combination, withone or more forming punches and dies, of means for partially severing ametal strip transversely between the impression receiving portionswhereby distortion of the strip by reason of the drawing of the metal inthe dies as the strip is fed through the press is prevented, the uncutportion of the strip acting as a carrier for the blanks as they passthrough the press.

-2. n a metal punching press, the combination, with a reciprocatingcross-head of one or more forming unches carried thereby, a shearingblade a so carriedby the cross-head in advance of the punches andadapted to partially sever a metal strip transversely between the imression receiving portions as the strip is fe through the press wherebydistortion of the strip by reason of the drawing of the metal in thedies is prevented, and dies to receive said blade and punches, the uncutportion of the strip acting as a carrier for the blanks as they passthrough the press.

3. In a metal punching press, the combination, with a reciprocatingcrosshead, of a punch-holder secured thereto and carrying a shearingblade, one or more eyelet forming punches, an eyelet perforating punch,a head forming punch out of line with the eyelet 'forming punches, and acutting out punch,

corresponding dies to receive said shearing blade and punches, and meansfor intermittently feeding a metal strip first to the shearing blade,whereby it is'partially severed be tween the eyelet portion of theblanks, the unseveredportion of the strip acting to carry said blanksonward between the several forming punch es and dies.

4. In a metal punching press, the combination, with a reciprocatingcross-head, of a punch holder secured thereto, a plurality of punchesmounted in said holder and' spaced apart on centers twice the distancebetween the centers of the blanks to be formed thereby, a plurality ofstationary dies to receive the unches, pockets between dies to receivethe blanks where they rest between dies, and means for feeding a metalstrip throughthe press with period1c movements equal to onehalf thedistance between punch centers.

5. In a metal punching press, the combination, with a reciprocatingcross-head, of a plurality of punch blocks carried thereby, a springactuated stripper late having slots through which the punch locks pass,forming heads or plungers projecting fromtheunocks, a supplementaryplate on the stripper plate provided with d In testimony whereof I haveafiiXed my guide-Ways through which certain of the signature, inpresence ef two Witnesses.

lon er forming heads or plungers pass, a pluraliTzy of fixed diesadapted to receive said JAMES EDEN 5 forming-heads or plungers, andmeans for Witnesses:

feeding and guiding a metal strip between the ARTHUR KERN,

dies. CHAS; J. EIJLSWORTH.

